I don't think a drug can feel and/or be inherently "evil", as the concept of evil in itself is an extremely subjective thing. I think the stuff you're experiencing is likely stuff that's coming from somewhere deep in your unconscious.
Not all dubstep gives me dark vibes but I watched this on 2C-E the other day and I was really not in a good place! http://www.youtube.com/watch?v=QeWXGy8Uack
Try a big dose of DOI. It's psychedelic poison.
I've tried a big dose of DOI, and I thought it was absolutely gentle and very reminiscent of 25i. Everyone reacts differently.
Mushrooms always felt like LSD's evil cousin, in my experience.
DOI is incredibly popular here due to its dark over tones.
